NC requires 4GB & Front end requires 2GB RAM minimum (my own experience) to make your cloud test & run. But having more is good for the performance boost.

Network Requirements:

All NCs must have access to a minimum of 1GB Ethernet network connectivity.

All Eucalyptus components must have at least one Network Interface Card (NIC) for a base-line deployment.

As we are using Faststart, we need two sets of IP addresses. The first range is private, to be used only within the Eucalyptus system itself. The second range is public, to be routable to and from end-users and VM instances. Both sets must be unique to Eucalyptus, not in use by other components or applications within your network.

And don't touch IP tables & firewall configurations as they are preconfigured.

For One Machine

At least one machine with 100GB disk space

A range of IP addresses to assign to Eucalyptus instances

Basic experience with:

Burning an ISO file to a DVD

Configuring a range of unused IP addresses on your network
(After range of Frontend and NC,for ex, 192.168.1.10 and 192.168.1.11,
After this give 20 IPs to Eucalyptus)

Provisioning a private subnet (IP most likely 10.10.1.0)

Once you are satisfied that your systems requirements are met, you are ready to plan your Eucalyptus installation.